/*
 * Tencent is pleased to support the open source community by making BK-CI 蓝鲸持续集成平台 available.
 *
 * Copyright (C) 2019 THL A29 Limited, a Tencent company.  All rights reserved.
 *
 * BK-CI 蓝鲸持续集成平台 is licensed under the MIT license.
 *
 * A copy of the MIT License is included in this file.
 *
 *
 * Terms of the MIT License:
 * ---------------------------------------------------
 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated
 * documentation files (the "Software"), to deal in the Software without restriction, including without limitation the
 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all copies or substantial portions of
 * the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT
 * LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
 * NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

package com.tencent.bkrepo.common.artifact.interceptor

import com.tencent.bkrepo.common.artifact.exception.ArtifactDownloadForbiddenException
import org.slf4j.LoggerFactory

/**
 * 下载拦截器
 */
abstract class DownloadInterceptor<R, A>(
    protected val rules: Map<String, Any>
) {
    abstract fun parseRule(): R

    abstract fun matcher(artifact: A, rule: R): Boolean

    open fun intercept(projectId: String, artifact: A) {
        val rule = try {
            parseRule()
        } catch (e: Exception) {
            logger.warn("fail to parse rule[$rules] of artifact[$artifact]", e)
            return
        }
        val match = matcher(artifact, rule)
        val forbidden = (allowed() && !match) || (!allowed() && match)
        if (forbidden) {
            throw ArtifactDownloadForbiddenException(projectId)
        }
    }

    /**
     * allowed表示拦截器规则是允许或禁止
     * allowed=true 允许
     * allowed=false 禁止
     *
     * @return 默认true
     */
    private fun allowed(): Boolean {
        return rules[ALLOWED] as? Boolean ?: true
    }

    companion object {
        private val logger = LoggerFactory.getLogger(DownloadInterceptor::class.java)
        const val ALLOWED = "allowed"
    }
}
